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[mimalloc] Only use __builtin_thread_pointer() in multithreaded builds #26747

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Merged
juj merged 1 commit into from
Apr 22, 2026
+7 −2
Merged

[mimalloc] Only use __builtin_thread_pointer() in multithreaded builds #26747

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9 changes: 7 additions & 2 deletions tools/system_libs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1889,8 +1889,6 @@ class libmimalloc(MTLibrary):
'-DNDEBUG',
# Emscripten uses musl libc internally
'-DMI_LIBC_MUSL',
# enable use of `__builtin_thread_pointer()`
'-DMI_USE_BUILTIN_THREAD_POINTER',
]

# malloc/free/calloc are runtime functions and can be generated during LTO
Expand All @@ -1913,6 +1911,13 @@ class libmimalloc(MTLibrary):
# Include sbrk.c in libc, it uses tracing and libc itself doesn't have a tracing variant.
src_files += [utils.path_from_root('system/lib/libc/sbrk.c')]

def get_cflags(self):
cflags = super().get_cflags()
if self.is_mt:
# enable use of `__builtin_thread_pointer()` in multithreaded builds
cflags += ['-DMI_USE_BUILTIN_THREAD_POINTER']
return cflags

def can_use(self):
return super().can_use() and settings.MALLOC == 'mimalloc'

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